From patchwork Wed Jun 12 17:52:49 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 10990573 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 246A01398 for ; Wed, 12 Jun 2019 17:54:34 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 14D1F288B8 for ; Wed, 12 Jun 2019 17:54:34 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0428528AA2; Wed, 12 Jun 2019 17:54:34 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4D3F5288B8 for ; Wed, 12 Jun 2019 17:54:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389675AbfFLRxm (ORCPT ); Wed, 12 Jun 2019 13:53:42 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:40848 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389624AbfFLRxV (ORCPT ); Wed, 12 Jun 2019 13:53:21 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc: To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=8dH0Zdi1b6MjYfgb9odloDVY4FfbVRDBfw/e3gt8b7s=; b=N8GUc01HFy+rR7xlaUfNQy7YsW hKF+iChYqaUGR5SVbXKOnVZUn5TLGTJixqEf3MDZyQlVQbyj8z5BHr5xPwom0E7H/NMO0KsVj98XN j8lXNhf09s8rcGZSdApD1qFPeTBqjaSiL7YRw7EYuuMZBbEn5m4/23yZD1Sj67SVF0sHyQsVevdT7 FIXChVUqI0PWUOnMm4m0KETHjQTTWSdRlVVGc+q81DOjwlOdQM5YeA0gX8nsVIdHHjxQDgGpwEQzZ TYWDk/46VyXO9UFwylB7oCaeZjZ4MUjbi+LH8lj91Nt7MgVvmtHV3SnZSYtMYoXLkGeDLMkhSgcAW anlry8Cg==; Received: from 201.86.169.251.dynamic.adsl.gvt.net.br ([201.86.169.251] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hb7Qx-0002Dk-GO; Wed, 12 Jun 2019 17:53:16 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92) (envelope-from ) id 1hb7Qq-0001gX-BM; Wed, 12 Jun 2019 14:53:08 -0300 From: Mauro Carvalho Chehab To: Linux Doc Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , linux-kernel@vger.kernel.org, Jonathan Corbet , Dave Young , Baoquan He , Vivek Goyal , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , Harry Wei , Alex Shi , Wim Van Sebroeck , Guenter Roeck , Russell King , Catalin Marinas , Will Deacon , Yoshinori Sato , Rich Felker , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , x86@kernel.org, kexec@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-watchdog@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sh@vger.kernel.org Subject: [PATCH v4 13/28] docs: kdump: convert docs to ReST and rename to *.rst Date: Wed, 12 Jun 2019 14:52:49 -0300 Message-Id: X-Mailer: git-send-email 2.21.0 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-watchdog-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Convert kdump documentation to ReST and add it to the user faced manual, as the documents are mainly focused on sysadmins that would be enabling kdump. Note: the vmcoreinfo.rst has one very long title on one of its sub-sections: PG_lru|PG_private|PG_swapcache|PG_swapbacked|PG_slab|PG_hwpoision|PG_head_mask|PAGE_BUDDY_MAPCOUNT_VALUE(~PG_buddy)|PAGE_OFFLINE_MAPCOUNT_VALUE(~PG_offline) I opted to break this one, into two entries with the same content, in order to make it easier to display after being parsed in html and PDF. The conversion is actually: - add blank lines and identation in order to identify paragraphs; - fix tables markups; - add some lists markups; - mark literal blocks; - adjust title markups. At its new index.rst, let's add a :orphan: while this is not linked to the main index.rst file, in order to avoid build warnings. Signed-off-by: Mauro Carvalho Chehab --- Documentation/admin-guide/bug-hunting.rst | 2 +- .../admin-guide/kernel-parameters.txt | 6 +- Documentation/kdump/index.rst | 21 +++ Documentation/kdump/{kdump.txt => kdump.rst} | 131 +++++++++++------- .../kdump/{vmcoreinfo.txt => vmcoreinfo.rst} | 59 ++++---- .../powerpc/firmware-assisted-dump.txt | 2 +- .../translations/zh_CN/oops-tracing.txt | 2 +- Documentation/watchdog/hpwdt.txt | 2 +- arch/arm/Kconfig | 2 +- arch/arm64/Kconfig | 2 +- arch/sh/Kconfig | 2 +- arch/x86/Kconfig | 4 +- 12 files changed, 137 insertions(+), 98 deletions(-) create mode 100644 Documentation/kdump/index.rst rename Documentation/kdump/{kdump.txt => kdump.rst} (91%) rename Documentation/kdump/{vmcoreinfo.txt => vmcoreinfo.rst} (95%) diff --git a/Documentation/admin-guide/bug-hunting.rst b/Documentation/admin-guide/bug-hunting.rst index f278b289e260..b761aa2a51d2 100644 --- a/Documentation/admin-guide/bug-hunting.rst +++ b/Documentation/admin-guide/bug-hunting.rst @@ -90,7 +90,7 @@ the disk is not available then you have three options: run a null modem to a second machine and capture the output there using your favourite communication program. Minicom works well. -(3) Use Kdump (see Documentation/kdump/kdump.txt), +(3) Use Kdump (see Documentation/kdump/kdump.rst), extract the kernel ring buffer from old memory with using dmesg gdbmacro in Documentation/kdump/gdbmacros.txt. diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index affed5d447de..c31373f39240 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -708,14 +708,14 @@ [KNL, x86_64] select a region under 4G first, and fall back to reserve region above 4G when '@offset' hasn't been specified. - See Documentation/kdump/kdump.txt for further details. + See Documentation/kdump/kdump.rst for further details. crashkernel=range1:size1[,range2:size2,...][@offset] [KNL] Same as above, but depends on the memory in the running system. The syntax of range is start-[end] where start and end are both a memory unit (amount[KMG]). See also - Documentation/kdump/kdump.txt for an example. + Documentation/kdump/kdump.rst for an example. crashkernel=size[KMG],high [KNL, x86_64] range could be above 4G. Allow kernel @@ -1207,7 +1207,7 @@ Specifies physical address of start of kernel core image elf header and optionally the size. Generally kexec loader will pass this option to capture kernel. - See Documentation/kdump/kdump.txt for details. + See Documentation/kdump/kdump.rst for details. enable_mtrr_cleanup [X86] The kernel tries to adjust MTRR layout from continuous diff --git a/Documentation/kdump/index.rst b/Documentation/kdump/index.rst new file mode 100644 index 000000000000..2b17fcf6867a --- /dev/null +++ b/Documentation/kdump/index.rst @@ -0,0 +1,21 @@ +:orphan: + +================================================================ +Documentation for Kdump - The kexec-based Crash Dumping Solution +================================================================ + +This document includes overview, setup and installation, and analysis +information. + +.. toctree:: + :maxdepth: 1 + + kdump + vmcoreinfo + +.. only:: subproject and html + + Indices + ======= + + * :ref:`genindex` diff --git a/Documentation/kdump/kdump.txt b/Documentation/kdump/kdump.rst similarity index 91% rename from Documentation/kdump/kdump.txt rename to Documentation/kdump/kdump.rst index 3162eeb8c262..ac7e131d2935 100644 --- a/Documentation/kdump/kdump.txt +++ b/Documentation/kdump/kdump.rst @@ -71,9 +71,8 @@ This is a symlink to the latest version. The latest kexec-tools git tree is available at: -git://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git -and -http://www.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git +- git://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git +- http://www.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git There is also a gitweb interface available at http://www.kernel.org/git/?p=utils/kernel/kexec/kexec-tools.git @@ -81,25 +80,25 @@ http://www.kernel.org/git/?p=utils/kernel/kexec/kexec-tools.git More information about kexec-tools can be found at http://horms.net/projects/kexec/ -3) Unpack the tarball with the tar command, as follows: +3) Unpack the tarball with the tar command, as follows:: - tar xvpzf kexec-tools.tar.gz + tar xvpzf kexec-tools.tar.gz -4) Change to the kexec-tools directory, as follows: +4) Change to the kexec-tools directory, as follows:: - cd kexec-tools-VERSION + cd kexec-tools-VERSION -5) Configure the package, as follows: +5) Configure the package, as follows:: - ./configure + ./configure -6) Compile the package, as follows: +6) Compile the package, as follows:: - make + make -7) Install the package, as follows: +7) Install the package, as follows:: - make install + make install Build the system and dump-capture kernels @@ -126,25 +125,25 @@ dump-capture kernels for enabling kdump support. System kernel config options ---------------------------- -1) Enable "kexec system call" in "Processor type and features." +1) Enable "kexec system call" in "Processor type and features.":: - CONFIG_KEXEC=y + CONFIG_KEXEC=y 2) Enable "sysfs file system support" in "Filesystem" -> "Pseudo - filesystems." This is usually enabled by default. + filesystems." This is usually enabled by default:: - CONFIG_SYSFS=y + CONFIG_SYSFS=y Note that "sysfs file system support" might not appear in the "Pseudo filesystems" menu if "Configure standard kernel features (for small systems)" is not enabled in "General Setup." In this case, check the - .config file itself to ensure that sysfs is turned on, as follows: + .config file itself to ensure that sysfs is turned on, as follows:: - grep 'CONFIG_SYSFS' .config + grep 'CONFIG_SYSFS' .config -3) Enable "Compile the kernel with debug info" in "Kernel hacking." +3) Enable "Compile the kernel with debug info" in "Kernel hacking.":: - CONFIG_DEBUG_INFO=Y + CONFIG_DEBUG_INFO=Y This causes the kernel to be built with debug symbols. The dump analysis tools require a vmlinux with debug symbols in order to read @@ -154,29 +153,32 @@ Dump-capture kernel config options (Arch Independent) ----------------------------------------------------- 1) Enable "kernel crash dumps" support under "Processor type and - features": + features":: - CONFIG_CRASH_DUMP=y + CONFIG_CRASH_DUMP=y -2) Enable "/proc/vmcore support" under "Filesystems" -> "Pseudo filesystems". +2) Enable "/proc/vmcore support" under "Filesystems" -> "Pseudo filesystems":: + + CONFIG_PROC_VMCORE=y - CONFIG_PROC_VMCORE=y (CONFIG_PROC_VMCORE is set by default when CONFIG_CRASH_DUMP is selected.) Dump-capture kernel config options (Arch Dependent, i386 and x86_64) -------------------------------------------------------------------- 1) On i386, enable high memory support under "Processor type and - features": + features":: - CONFIG_HIGHMEM64G=y - or - CONFIG_HIGHMEM4G + CONFIG_HIGHMEM64G=y + + or:: + + CONFIG_HIGHMEM4G 2) On i386 and x86_64, disable symmetric multi-processing support - under "Processor type and features": + under "Processor type and features":: - CONFIG_SMP=n + CONFIG_SMP=n (If CONFIG_SMP=y, then specify maxcpus=1 on the kernel command line when loading the dump-capture kernel, see section "Load the Dump-capture @@ -184,9 +186,9 @@ Dump-capture kernel config options (Arch Dependent, i386 and x86_64) 3) If one wants to build and use a relocatable kernel, Enable "Build a relocatable kernel" support under "Processor type and - features" + features":: - CONFIG_RELOCATABLE=y + CONFIG_RELOCATABLE=y 4) Use a suitable value for "Physical address where the kernel is loaded" (under "Processor type and features"). This only appears when @@ -211,13 +213,13 @@ Dump-capture kernel config options (Arch Dependent, i386 and x86_64) Dump-capture kernel config options (Arch Dependent, ppc64) ---------------------------------------------------------- -1) Enable "Build a kdump crash kernel" support under "Kernel" options: +1) Enable "Build a kdump crash kernel" support under "Kernel" options:: - CONFIG_CRASH_DUMP=y + CONFIG_CRASH_DUMP=y -2) Enable "Build a relocatable kernel" support +2) Enable "Build a relocatable kernel" support:: - CONFIG_RELOCATABLE=y + CONFIG_RELOCATABLE=y Make and install the kernel and its modules. @@ -231,11 +233,13 @@ Dump-capture kernel config options (Arch Dependent, ia64) The crashkernel region can be automatically placed by the system kernel at run time. This is done by specifying the base address as 0, - or omitting it all together. + or omitting it all together:: - crashkernel=256M@0 - or - crashkernel=256M + crashkernel=256M@0 + + or:: + + crashkernel=256M If the start address is specified, note that the start address of the kernel will be aligned to 64Mb, so if the start address is not then @@ -245,9 +249,9 @@ Dump-capture kernel config options (Arch Dependent, arm) ---------------------------------------------------------- - To use a relocatable kernel, - Enable "AUTO_ZRELADDR" support under "Boot" options: + Enable "AUTO_ZRELADDR" support under "Boot" options:: - AUTO_ZRELADDR=y + AUTO_ZRELADDR=y Dump-capture kernel config options (Arch Dependent, arm64) ---------------------------------------------------------- @@ -265,12 +269,12 @@ on the value of System RAM -- that's mostly for distributors that pre-setup the kernel command line to avoid a unbootable system after some memory has been removed from the machine. -The syntax is: +The syntax is:: crashkernel=:[,:,...][@offset] range=start-[end] -For example: +For example:: crashkernel=512M-2G:64M,2G-:128M @@ -326,35 +330,46 @@ can choose to load the uncompressed vmlinux or compressed bzImage/vmlinuz of dump-capture kernel. Following is the summary. For i386 and x86_64: + - Use vmlinux if kernel is not relocatable. - Use bzImage/vmlinuz if kernel is relocatable. + For ppc64: + - Use vmlinux + For ia64: + - Use vmlinux or vmlinuz.gz + For s390x: + - Use image or bzImage + For arm: + - Use zImage + For arm64: + - Use vmlinux or Image If you are using an uncompressed vmlinux image then use following command -to load dump-capture kernel. +to load dump-capture kernel:: kexec -p \ --initrd= --args-linux \ --append="root= " If you are using a compressed bzImage/vmlinuz, then use following command -to load dump-capture kernel. +to load dump-capture kernel:: kexec -p \ --initrd= \ --append="root= " If you are using a compressed zImage, then use following command -to load dump-capture kernel. +to load dump-capture kernel:: kexec --type zImage -p \ --initrd= \ @@ -362,7 +377,7 @@ to load dump-capture kernel. --append="root= " If you are using an uncompressed Image, then use following command -to load dump-capture kernel. +to load dump-capture kernel:: kexec -p \ --initrd= \ @@ -376,18 +391,23 @@ Following are the arch specific command line options to be used while loading dump-capture kernel. For i386, x86_64 and ia64: + "1 irqpoll maxcpus=1 reset_devices" For ppc64: + "1 maxcpus=1 noirqdistrib reset_devices" For s390x: + "1 maxcpus=1 cgroup_disable=memory" For arm: + "1 maxcpus=1 reset_devices" For arm64: + "1 maxcpus=1 reset_devices" Notes on loading the dump-capture kernel: @@ -464,7 +484,7 @@ Write Out the Dump File ======================= After the dump-capture kernel is booted, write out the dump file with -the following command: +the following command:: cp /proc/vmcore @@ -476,7 +496,7 @@ Before analyzing the dump image, you should reboot into a stable kernel. You can do limited analysis using GDB on the dump file copied out of /proc/vmcore. Use the debug vmlinux built with -g and run the following -command: +command:: gdb vmlinux @@ -504,6 +524,11 @@ to achieve the same behaviour. Contact ======= -Vivek Goyal (vgoyal@redhat.com) -Maneesh Soni (maneesh@in.ibm.com) +- Vivek Goyal (vgoyal@redhat.com) +- Maneesh Soni (maneesh@in.ibm.com) +GDB macros +========== + +.. include:: gdbmacros.txt + :literal: diff --git a/Documentation/kdump/vmcoreinfo.txt b/Documentation/kdump/vmcoreinfo.rst similarity index 95% rename from Documentation/kdump/vmcoreinfo.txt rename to Documentation/kdump/vmcoreinfo.rst index bb94a4bd597a..007a6b86e0ee 100644 --- a/Documentation/kdump/vmcoreinfo.txt +++ b/Documentation/kdump/vmcoreinfo.rst @@ -1,8 +1,7 @@ -================================================================ - VMCOREINFO -================================================================ +========== +VMCOREINFO +========== -=========== What is it? =========== @@ -12,7 +11,6 @@ values, field offsets, etc. These data are packed into an ELF note section and used by user-space tools like crash and makedumpfile to analyze a kernel's memory layout. -================ Common variables ================ @@ -49,7 +47,7 @@ in a system, one bit position per node number. Used to keep track of which nodes are in the system and online. swapper_pg_dir -------------- +-------------- The global page directory pointer of the kernel. Used to translate virtual to physical addresses. @@ -132,16 +130,14 @@ nodemask_t The size of a nodemask_t type. Used to compute the number of online nodes. -(page, flags|_refcount|mapping|lru|_mapcount|private|compound_dtor| - compound_order|compound_head) -------------------------------------------------------------------- +(page, flags|_refcount|mapping|lru|_mapcount|private|compound_dtor|compound_order|compound_head) +------------------------------------------------------------------------------------------------- User-space tools compute their values based on the offset of these variables. The variables are used when excluding unnecessary pages. -(pglist_data, node_zones|nr_zones|node_mem_map|node_start_pfn|node_ - spanned_pages|node_id) -------------------------------------------------------------------- +(pglist_data, node_zones|nr_zones|node_mem_map|node_start_pfn|node_spanned_pages|node_id) +----------------------------------------------------------------------------------------- On NUMA machines, each NUMA node has a pg_data_t to describe its memory layout. On UMA machines there is a single pglist_data which describes the @@ -245,21 +241,25 @@ NR_FREE_PAGES On linux-2.6.21 or later, the number of free pages is in vm_stat[NR_FREE_PAGES]. Used to get the number of free pages. -PG_lru|PG_private|PG_swapcache|PG_swapbacked|PG_slab|PG_hwpoision -|PG_head_mask|PAGE_BUDDY_MAPCOUNT_VALUE(~PG_buddy) -|PAGE_OFFLINE_MAPCOUNT_VALUE(~PG_offline) ------------------------------------------------------------------ +PG_lru|PG_private|PG_swapcache|PG_swapbacked|PG_slab|PG_hwpoision|PG_head_mask +------------------------------------------------------------------------------ Page attributes. These flags are used to filter various unnecessary for dumping pages. +PAGE_BUDDY_MAPCOUNT_VALUE(~PG_buddy)|PAGE_OFFLINE_MAPCOUNT_VALUE(~PG_offline) +----------------------------------------------------------------------------- + +More page attributes. These flags are used to filter various unnecessary for +dumping pages. + + HUGETLB_PAGE_DTOR ----------------- The HUGETLB_PAGE_DTOR flag denotes hugetlbfs pages. Makedumpfile excludes these pages. -====== x86_64 ====== @@ -318,12 +318,12 @@ address. Currently, sme_mask stores the value of the C-bit position. If needed, additional SME-relevant info can be placed in that variable. -For example: -[ misc ][ enc bit ][ other misc SME info ] -0000_0000_0000_0000_1000_0000_0000_0000_0000_0000_..._0000 -63 59 55 51 47 43 39 35 31 27 ... 3 +For example:: + + [ misc ][ enc bit ][ other misc SME info ] + 0000_0000_0000_0000_1000_0000_0000_0000_0000_0000_..._0000 + 63 59 55 51 47 43 39 35 31 27 ... 3 -====== x86_32 ====== @@ -335,7 +335,6 @@ of a higher page table lookup overhead, and also consumes more page table space per process. Used to check whether PAE was enabled in the crash kernel when converting virtual addresses to physical addresses. -==== ia64 ==== @@ -366,7 +365,6 @@ PGTABLE_3|PGTABLE_4 User-space tools need to know whether the crash kernel was in 3-level or 4-level paging mode. Used to distinguish the page table. -===== ARM64 ===== @@ -395,9 +393,8 @@ KERNELOFFSET The kernel randomization offset. Used to compute the page offset. If KASLR is disabled, this value is zero. -==== arm -==== +=== ARM_LPAE -------- @@ -405,12 +402,11 @@ ARM_LPAE It indicates whether the crash kernel supports large physical address extensions. Used to translate virtual to physical addresses. -==== s390 ==== lowcore_ptr ----------- +----------- An array with a pointer to the lowcore of every CPU. Used to print the psw and all registers information. @@ -425,7 +421,6 @@ Used to get the vmalloc_start address from the high_memory symbol. The maximum number of CPUs. -======= powerpc ======= @@ -460,9 +455,8 @@ Page size definitions, i.e. 4k, 64k, or 16M. Used to make vtop translations. -vmemmap_backing|(vmemmap_backing, list)|(vmemmap_backing, phys)| -(vmemmap_backing, virt_addr) ----------------------------------------------------------------- +vmemmap_backing|(vmemmap_backing, list)|(vmemmap_backing, phys)|(vmemmap_backing, virt_addr) +-------------------------------------------------------------------------------------------- The vmemmap virtual address space management does not have a traditional page table to track which virtual struct pages are backed by a physical @@ -480,7 +474,6 @@ member. Used in vtop translations. -== sh == diff --git a/Documentation/powerpc/firmware-assisted-dump.txt b/Documentation/powerpc/firmware-assisted-dump.txt index 18c5feef2577..0c41d6d463f3 100644 --- a/Documentation/powerpc/firmware-assisted-dump.txt +++ b/Documentation/powerpc/firmware-assisted-dump.txt @@ -59,7 +59,7 @@ as follows: the default calculated size. Use this option if default boot memory size is not sufficient for second kernel to boot successfully. For syntax of crashkernel= parameter, - refer to Documentation/kdump/kdump.txt. If any offset is + refer to Documentation/kdump/kdump.rst. If any offset is provided in crashkernel= parameter, it will be ignored as fadump uses a predefined offset to reserve memory for boot memory dump preservation in case of a crash. diff --git a/Documentation/translations/zh_CN/oops-tracing.txt b/Documentation/translations/zh_CN/oops-tracing.txt index 93fa061cf9e4..368ddd05b304 100644 --- a/Documentation/translations/zh_CN/oops-tracing.txt +++ b/Documentation/translations/zh_CN/oops-tracing.txt @@ -53,7 +53,7 @@ cat /proc/kmsg > file， 然而你必须介入中止传输， kmsg是一个“ （2）用串口终端启动（请参看Documentation/admin-guide/serial-console.rst），运行一个null modem到另一台机器并用你喜欢的通讯工具获取输出。Minicom工作地很好。 -（3）使用Kdump（请参看Documentation/kdump/kdump.txt）， +（3）使用Kdump（请参看Documentation/kdump/kdump.rst）， 使用在Documentation/kdump/gdbmacros.txt中定义的dmesg gdb宏，从旧的内存中提取内核 环形缓冲区。 diff --git a/Documentation/watchdog/hpwdt.txt b/Documentation/watchdog/hpwdt.txt index 55df692c5595..aaa9e4b4bdcd 100644 --- a/Documentation/watchdog/hpwdt.txt +++ b/Documentation/watchdog/hpwdt.txt @@ -51,7 +51,7 @@ Last reviewed: 08/20/2018 and loop forever. This is generally not what a watchdog user wants. For those wishing to learn more please see: - Documentation/kdump/kdump.txt + Documentation/kdump/kdump.rst Documentation/admin-guide/kernel-parameters.txt (panic=) Your Linux Distribution specific documentation. diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 204cbc6bf234..af58d31ee4e1 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -2006,7 +2006,7 @@ config CRASH_DUMP kdump/kexec. The crash dump kernel must be compiled to a memory address not used by the main kernel - For more details see Documentation/kdump/kdump.txt + For more details see Documentation/kdump/kdump.rst config AUTO_ZRELADDR bool "Auto calculation of the decompressed kernel image address" diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index c2afcea9b19b..ac33b4bd1624 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -996,7 +996,7 @@ config CRASH_DUMP reserved region and then later executed after a crash by kdump/kexec. - For more details see Documentation/kdump/kdump.txt + For more details see Documentation/kdump/kdump.rst config XEN_DOM0 def_bool y diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig index b77f512bb176..ce1a28654507 100644 --- a/arch/sh/Kconfig +++ b/arch/sh/Kconfig @@ -623,7 +623,7 @@ config CRASH_DUMP to a memory address not used by the main kernel using PHYSICAL_START. - For more details see Documentation/kdump/kdump.txt + For more details see Documentation/kdump/kdump.rst config KEXEC_JUMP bool "kexec jump (EXPERIMENTAL)" diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 4b37664e7471..a109141a8d3b 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -2038,7 +2038,7 @@ config CRASH_DUMP to a memory address not used by the main kernel or BIOS using PHYSICAL_START, or it must be built as a relocatable image (CONFIG_RELOCATABLE=y). - For more details see Documentation/kdump/kdump.txt + For more details see Documentation/kdump/kdump.rst config KEXEC_JUMP bool "kexec jump" @@ -2075,7 +2075,7 @@ config PHYSICAL_START the reserved region. In other words, it can be set based on the "X" value as specified in the "crashkernel=YM@XM" command line boot parameter passed to the panic-ed - kernel. Please take a look at Documentation/kdump/kdump.txt + kernel. Please take a look at Documentation/kdump/kdump.rst for more details about crash dumps. Usage of bzImage for capturing the crash dump is recommended as From patchwork Wed Jun 12 17:53:01 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 10990583 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C34971398 for ; Wed, 12 Jun 2019 17:54:50 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id AC40D28A9D for ; Wed, 12 Jun 2019 17:54:50 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A079B28AA2; Wed, 12 Jun 2019 17:54:50 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2628528AA1 for ; Wed, 12 Jun 2019 17:54:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389807AbfFLRyk (ORCPT ); Wed, 12 Jun 2019 13:54:40 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:40784 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389476AbfFLRxU (ORCPT ); Wed, 12 Jun 2019 13:53:20 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=SXHP5HpTCxS0n+0N8Ut+tBqlzcfMCkvKsXH1wZl3iSQ=; b=BLkQcWp4ZBzObgFFYP6IDHUf5h FT0Hj8xpMpjaw2+gfaRDD4mVx2rhLU2cYEZiEO5Otua1YOm4h/spFFp9gpR8XdzMkwF+O7uX3LYm9 ypfnD3dXPLrWmyGKTs7Qf2fahtv4wKF5+kN6ehSxfjckrIpC3/HH+5X1RuacclkCg04f1xYBmwPUs I26T4gOE/A9ojo01U4OlbURxAm4xxZ7bcbpMH41Bc/at2WzLNcsGmLejfQpYShyIyNeeAd+h05CS1 EmdzCDvpDnQtdgx0Y7I20Yp9kYi6NrjwU0R0u/Rk09SmNtPIja6fg1IOZaBXrsPqh6L5fulcZ7qUK FzYzl/vA==; Received: from 201.86.169.251.dynamic.adsl.gvt.net.br ([201.86.169.251] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hb7Qy-0002Dt-2D; Wed, 12 Jun 2019 17:53:18 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92) (envelope-from ) id 1hb7Qq-0001hZ-NA; Wed, 12 Jun 2019 14:53:08 -0300 From: Mauro Carvalho Chehab To: Linux Doc Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , linux-kernel@vger.kernel.org, Jonathan Corbet , Wim Van Sebroeck , Guenter Roeck , Jerry Hoemann , linux-watchdog@vger.kernel.org Subject: [PATCH v4 25/28] docs: watchdog: convert docs to ReST and rename to *.rst Date: Wed, 12 Jun 2019 14:53:01 -0300 Message-Id: X-Mailer: git-send-email 2.21.0 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-watchdog-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Convert those documents and prepare them to be part of the kernel API book, as most of the stuff there are related to the Kernel interfaces. Still, in the future, it would make sense to split the docs, as some of the stuff is clearly focused on sysadmin tasks. The conversion is actually: - add blank lines and identation in order to identify paragraphs; - fix tables markups; - add some lists markups; - mark literal blocks; - adjust title markups. At its new index.rst, let's add a :orphan: while this is not linked to the main index.rst file, in order to avoid build warnings. Signed-off-by: Mauro Carvalho Chehab Reviewed-by: Guenter Roeck --- .../admin-guide/kernel-parameters.txt | 2 +- Documentation/kernel-per-CPU-kthreads.txt | 2 +- ....txt => convert_drivers_to_kernel_api.rst} | 109 +-- .../watchdog/{hpwdt.txt => hpwdt.rst} | 25 +- Documentation/watchdog/index.rst | 25 + .../watchdog/{mlx-wdt.txt => mlx-wdt.rst} | 24 +- .../{pcwd-watchdog.txt => pcwd-watchdog.rst} | 13 +- .../{watchdog-api.txt => watchdog-api.rst} | 76 +- ...kernel-api.txt => watchdog-kernel-api.rst} | 91 ++- .../watchdog/watchdog-parameters.rst | 736 ++++++++++++++++++ .../watchdog/watchdog-parameters.txt | 410 ---------- .../{watchdog-pm.txt => watchdog-pm.rst} | 3 + Documentation/watchdog/{wdt.txt => wdt.rst} | 31 +- MAINTAINERS | 2 +- drivers/watchdog/Kconfig | 6 +- drivers/watchdog/smsc37b787_wdt.c | 2 +- 16 files changed, 1004 insertions(+), 553 deletions(-) rename Documentation/watchdog/{convert_drivers_to_kernel_api.txt => convert_drivers_to_kernel_api.rst} (75%) rename Documentation/watchdog/{hpwdt.txt => hpwdt.rst} (79%) create mode 100644 Documentation/watchdog/index.rst rename Documentation/watchdog/{mlx-wdt.txt => mlx-wdt.rst} (78%) rename Documentation/watchdog/{pcwd-watchdog.txt => pcwd-watchdog.rst} (89%) rename Documentation/watchdog/{watchdog-api.txt => watchdog-api.rst} (80%) rename Documentation/watchdog/{watchdog-kernel-api.txt => watchdog-kernel-api.rst} (90%) create mode 100644 Documentation/watchdog/watchdog-parameters.rst delete mode 100644 Documentation/watchdog/watchdog-parameters.txt rename Documentation/watchdog/{watchdog-pm.txt => watchdog-pm.rst} (92%) rename Documentation/watchdog/{wdt.txt => wdt.rst} (68%) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 0092a453f7dc..3d072ca532bb 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -5182,7 +5182,7 @@ Default: 3 = cyan. watchdog timers [HW,WDT] For information on watchdog timers, - see Documentation/watchdog/watchdog-parameters.txt + see Documentation/watchdog/watchdog-parameters.rst or other driver-specific files in the Documentation/watchdog/ directory. diff --git a/Documentation/kernel-per-CPU-kthreads.txt b/Documentation/kernel-per-CPU-kthreads.txt index 23b0c8b20cd1..5623b9916411 100644 --- a/Documentation/kernel-per-CPU-kthreads.txt +++ b/Documentation/kernel-per-CPU-kthreads.txt @@ -348,7 +348,7 @@ To reduce its OS jitter, do at least one of the following: 2. Boot with "nosoftlockup=0", which will also prevent these kthreads from being created. Other related watchdog and softlockup boot parameters may be found in Documentation/admin-guide/kernel-parameters.rst - and Documentation/watchdog/watchdog-parameters.txt. + and Documentation/watchdog/watchdog-parameters.rst. 3. Echo a zero to /proc/sys/kernel/watchdog to disable the watchdog timer. 4. Echo a large number of /proc/sys/kernel/watchdog_thresh in diff --git a/Documentation/watchdog/convert_drivers_to_kernel_api.txt b/Documentation/watchdog/convert_drivers_to_kernel_api.rst similarity index 75% rename from Documentation/watchdog/convert_drivers_to_kernel_api.txt rename to Documentation/watchdog/convert_drivers_to_kernel_api.rst index 9fffb2958d13..dd934cc08e40 100644 --- a/Documentation/watchdog/convert_drivers_to_kernel_api.txt +++ b/Documentation/watchdog/convert_drivers_to_kernel_api.rst @@ -1,6 +1,8 @@ +========================================================= Converting old watchdog drivers to the watchdog framework +========================================================= + by Wolfram Sang -========================================================= Before the watchdog framework came into the kernel, every driver had to implement the API on its own. Now, as the framework factored out the common @@ -69,16 +71,16 @@ Here is a overview of the functions and probably needed actions: -ENOIOCTLCMD, the IOCTLs of the framework will be tried, too. Any other error is directly given to the user. -Example conversion: +Example conversion:: --static const struct file_operations s3c2410wdt_fops = { -- .owner = THIS_MODULE, -- .llseek = no_llseek, -- .write = s3c2410wdt_write, -- .unlocked_ioctl = s3c2410wdt_ioctl, -- .open = s3c2410wdt_open, -- .release = s3c2410wdt_release, --}; + -static const struct file_operations s3c2410wdt_fops = { + - .owner = THIS_MODULE, + - .llseek = no_llseek, + - .write = s3c2410wdt_write, + - .unlocked_ioctl = s3c2410wdt_ioctl, + - .open = s3c2410wdt_open, + - .release = s3c2410wdt_release, + -}; Check the functions for device-specific stuff and keep it for later refactoring. The rest can go. @@ -89,24 +91,24 @@ Remove the miscdevice Since the file_operations are gone now, you can also remove the 'struct miscdevice'. The framework will create it on watchdog_dev_register() called by -watchdog_register_device(). +watchdog_register_device():: --static struct miscdevice s3c2410wdt_miscdev = { -- .minor = WATCHDOG_MINOR, -- .name = "watchdog", -- .fops = &s3c2410wdt_fops, --}; + -static struct miscdevice s3c2410wdt_miscdev = { + - .minor = WATCHDOG_MINOR, + - .name = "watchdog", + - .fops = &s3c2410wdt_fops, + -}; Remove obsolete includes and defines ------------------------------------ Because of the simplifications, a few defines are probably unused now. Remove -them. Includes can be removed, too. For example: +them. Includes can be removed, too. For example:: -- #include -- #include (if MODULE_ALIAS_MISCDEV is not used) -- #include (if no custom IOCTLs are used) + - #include + - #include (if MODULE_ALIAS_MISCDEV is not used) + - #include (if no custom IOCTLs are used) Add the watchdog operations @@ -121,30 +123,30 @@ change the function header. Other changes are most likely not needed, because here simply happens the direct hardware access. If you have device-specific code left from the above steps, it should be refactored into these callbacks. -Here is a simple example: +Here is a simple example:: -+static struct watchdog_ops s3c2410wdt_ops = { -+ .owner = THIS_MODULE, -+ .start = s3c2410wdt_start, -+ .stop = s3c2410wdt_stop, -+ .ping = s3c2410wdt_keepalive, -+ .set_timeout = s3c2410wdt_set_heartbeat, -+}; + +static struct watchdog_ops s3c2410wdt_ops = { + + .owner = THIS_MODULE, + + .start = s3c2410wdt_start, + + .stop = s3c2410wdt_stop, + + .ping = s3c2410wdt_keepalive, + + .set_timeout = s3c2410wdt_set_heartbeat, + +}; -A typical function-header change looks like: +A typical function-header change looks like:: --static void s3c2410wdt_keepalive(void) -+static int s3c2410wdt_keepalive(struct watchdog_device *wdd) - { -... -+ -+ return 0; - } + -static void s3c2410wdt_keepalive(void) + +static int s3c2410wdt_keepalive(struct watchdog_device *wdd) + { + ... + + + + return 0; + } -... + ... -- s3c2410wdt_keepalive(); -+ s3c2410wdt_keepalive(&s3c2410_wdd); + - s3c2410wdt_keepalive(); + + s3c2410wdt_keepalive(&s3c2410_wdd); Add the watchdog device @@ -159,12 +161,12 @@ static variables. Those have to be converted to use the members in watchdog_device. Note that the timeout values are unsigned int. Some drivers use signed int, so this has to be converted, too. -Here is a simple example for a watchdog device: +Here is a simple example for a watchdog device:: -+static struct watchdog_device s3c2410_wdd = { -+ .info = &s3c2410_wdt_ident, -+ .ops = &s3c2410wdt_ops, -+}; + +static struct watchdog_device s3c2410_wdd = { + + .info = &s3c2410_wdt_ident, + + .ops = &s3c2410wdt_ops, + +}; Handle the 'nowayout' feature @@ -173,12 +175,12 @@ Handle the 'nowayout' feature A few drivers use nowayout statically, i.e. there is no module parameter for it and only CONFIG_WATCHDOG_NOWAYOUT determines if the feature is going to be used. This needs to be converted by initializing the status variable of the -watchdog_device like this: +watchdog_device like this:: .status = WATCHDOG_NOWAYOUT_INIT_STATUS, Most drivers, however, also allow runtime configuration of nowayout, usually -by adding a module parameter. The conversion for this would be something like: +by adding a module parameter. The conversion for this would be something like:: watchdog_set_nowayout(&s3c2410_wdd, nowayout); @@ -191,15 +193,15 @@ Register the watchdog device Replace misc_register(&miscdev) with watchdog_register_device(&watchdog_dev). Make sure the return value gets checked and the error message, if present, -still fits. Also convert the unregister case. +still fits. Also convert the unregister case:: -- ret = misc_register(&s3c2410wdt_miscdev); -+ ret = watchdog_register_device(&s3c2410_wdd); + - ret = misc_register(&s3c2410wdt_miscdev); + + ret = watchdog_register_device(&s3c2410_wdd); -... + ... -- misc_deregister(&s3c2410wdt_miscdev); -+ watchdog_unregister_device(&s3c2410_wdd); + - misc_deregister(&s3c2410wdt_miscdev); + + watchdog_unregister_device(&s3c2410_wdd); Update the Kconfig-entry @@ -207,7 +209,7 @@ Update the Kconfig-entry The entry for the driver now needs to select WATCHDOG_CORE: -+ select WATCHDOG_CORE + + select WATCHDOG_CORE Create a patch and send it to upstream @@ -215,4 +217,3 @@ Create a patch and send it to upstream Make sure you understood Documentation/process/submitting-patches.rst and send your patch to linux-watchdog@vger.kernel.org. We are looking forward to it :) - diff --git a/Documentation/watchdog/hpwdt.txt b/Documentation/watchdog/hpwdt.rst similarity index 79% rename from Documentation/watchdog/hpwdt.txt rename to Documentation/watchdog/hpwdt.rst index aaa9e4b4bdcd..94a96371113e 100644 --- a/Documentation/watchdog/hpwdt.txt +++ b/Documentation/watchdog/hpwdt.rst @@ -1,7 +1,12 @@ +=========================== +HPE iLO NMI Watchdog Driver +=========================== + +for iLO based ProLiant Servers +============================== + Last reviewed: 08/20/2018 - HPE iLO NMI Watchdog Driver - for iLO based ProLiant Servers The HPE iLO NMI Watchdog driver is a kernel module that provides basic watchdog functionality and handler for the iLO "Generate NMI to System" @@ -20,23 +25,26 @@ Last reviewed: 08/20/2018 The hpwdt driver also has the following module parameters: - soft_margin - allows the user to set the watchdog timer value. + ============ ================================================================ + soft_margin allows the user to set the watchdog timer value. Default value is 30 seconds. - timeout - an alias of soft_margin. - pretimeout - allows the user to set the watchdog pretimeout value. + timeout an alias of soft_margin. + pretimeout allows the user to set the watchdog pretimeout value. This is the number of seconds before timeout when an NMI is delivered to the system. Setting the value to zero disables the pretimeout NMI. Default value is 9 seconds. - nowayout - basic watchdog parameter that does not allow the timer to + nowayout basic watchdog parameter that does not allow the timer to be restarted or an impending ASR to be escaped. Default value is set when compiling the kernel. If it is set to "Y", then there is no way of disabling the watchdog once it has been started. + ============ ================================================================ - NOTE: More information about watchdog drivers in general, including the ioctl + NOTE: + More information about watchdog drivers in general, including the ioctl interface to /dev/watchdog can be found in - Documentation/watchdog/watchdog-api.txt and Documentation/IPMI.txt. + Documentation/watchdog/watchdog-api.rst and Documentation/IPMI.txt. Due to limitations in the iLO hardware, the NMI pretimeout if enabled, can only be set to 9 seconds. Attempts to set pretimeout to other @@ -63,4 +71,3 @@ Last reviewed: 08/20/2018 The HPE iLO NMI Watchdog Driver and documentation were originally developed by Tom Mingarelli. - diff --git a/Documentation/watchdog/index.rst b/Documentation/watchdog/index.rst new file mode 100644 index 000000000000..33a0de631e84 --- /dev/null +++ b/Documentation/watchdog/index.rst @@ -0,0 +1,25 @@ +:orphan: + +====================== +Linux Watchdog Support +====================== + +.. toctree:: + :maxdepth: 1 + + hpwdt + mlx-wdt + pcwd-watchdog + watchdog-api + watchdog-kernel-api + watchdog-parameters + watchdog-pm + wdt + convert_drivers_to_kernel_api + +.. only:: subproject and html + + Indices + ======= + + * :ref:`genindex` diff --git a/Documentation/watchdog/mlx-wdt.txt b/Documentation/watchdog/mlx-wdt.rst similarity index 78% rename from Documentation/watchdog/mlx-wdt.txt rename to Documentation/watchdog/mlx-wdt.rst index 66eeb78505c3..bf5bafac47f0 100644 --- a/Documentation/watchdog/mlx-wdt.txt +++ b/Documentation/watchdog/mlx-wdt.rst @@ -1,5 +1,9 @@ - Mellanox watchdog drivers - for x86 based system switches +========================= +Mellanox watchdog drivers +========================= + +for x86 based system switches +============================= This driver provides watchdog functionality for various Mellanox Ethernet and Infiniband switch systems. @@ -9,16 +13,16 @@ Mellanox watchdog device is implemented in a programmable logic device. There are 2 types of HW watchdog implementations. Type 1: -Actual HW timeout can be defined as a power of 2 msec. -e.g. timeout 20 sec will be rounded up to 32768 msec. -The maximum timeout period is 32 sec (32768 msec.), -Get time-left isn't supported + Actual HW timeout can be defined as a power of 2 msec. + e.g. timeout 20 sec will be rounded up to 32768 msec. + The maximum timeout period is 32 sec (32768 msec.), + Get time-left isn't supported Type 2: -Actual HW timeout is defined in sec. and it's the same as -a user-defined timeout. -Maximum timeout is 255 sec. -Get time-left is supported. + Actual HW timeout is defined in sec. and it's the same as + a user-defined timeout. + Maximum timeout is 255 sec. + Get time-left is supported. Type 1 HW watchdog implementation exist in old systems and all new systems have type 2 HW watchdog. diff --git a/Documentation/watchdog/pcwd-watchdog.txt b/Documentation/watchdog/pcwd-watchdog.rst similarity index 89% rename from Documentation/watchdog/pcwd-watchdog.txt rename to Documentation/watchdog/pcwd-watchdog.rst index b8e60a441a43..405e2a370082 100644 --- a/Documentation/watchdog/pcwd-watchdog.txt +++ b/Documentation/watchdog/pcwd-watchdog.rst @@ -1,8 +1,13 @@ +=================================== +Berkshire Products PC Watchdog Card +=================================== + Last reviewed: 10/05/2007 - Berkshire Products PC Watchdog Card - Support for ISA Cards Revision A and C - Documentation and Driver by Ken Hollis +Support for ISA Cards Revision A and C +======================================= + +Documentation and Driver by Ken Hollis The PC Watchdog is a card that offers the same type of functionality that the WDT card does, only it doesn't require an IRQ to run. Furthermore, @@ -33,6 +38,7 @@ Last reviewed: 10/05/2007 WDIOC_GETSUPPORT This returns the support of the card itself. This returns in structure "PCWDS" which returns: + options = WDIOS_TEMPPANIC (This card supports temperature) firmware_version = xxxx @@ -63,4 +69,3 @@ Last reviewed: 10/05/2007 -- Ken Hollis (kenji@bitgate.com) - diff --git a/Documentation/watchdog/watchdog-api.txt b/Documentation/watchdog/watchdog-api.rst similarity index 80% rename from Documentation/watchdog/watchdog-api.txt rename to Documentation/watchdog/watchdog-api.rst index 0e62ba33b7fb..c6c1e9fa9f73 100644 --- a/Documentation/watchdog/watchdog-api.txt +++ b/Documentation/watchdog/watchdog-api.rst @@ -1,7 +1,10 @@ +============================= +The Linux Watchdog driver API +============================= + Last reviewed: 10/05/2007 -The Linux Watchdog driver API. Copyright 2002 Christer Weingel @@ -10,7 +13,8 @@ driver which is (c) Copyright 2000 Jakob Oestergaard This document describes the state of the Linux 2.4.18 kernel. -Introduction: +Introduction +============ A Watchdog Timer (WDT) is a hardware circuit that can reset the computer system in case of a software fault. You probably knew that @@ -30,7 +34,8 @@ drivers implement different, and sometimes incompatible, parts of it. This file is an attempt to document the existing usage and allow future driver writers to use it as a reference. -The simplest API: +The simplest API +================ All drivers support the basic mode of operation, where the watchdog activates as soon as /dev/watchdog is opened and will reboot unless @@ -54,7 +59,8 @@ after the timeout has passed. Watchdog devices also usually support the nowayout module parameter so that this option can be controlled at runtime. -Magic Close feature: +Magic Close feature +=================== If a driver supports "Magic Close", the driver will not disable the watchdog unless a specific magic character 'V' has been sent to @@ -64,7 +70,8 @@ will assume that the daemon (and userspace in general) died, and will stop pinging the watchdog without disabling it first. This will then cause a reboot if the watchdog is not re-opened in sufficient time. -The ioctl API: +The ioctl API +============= All conforming drivers also support an ioctl API. @@ -73,7 +80,7 @@ Pinging the watchdog using an ioctl: All drivers that have an ioctl interface support at least one ioctl, KEEPALIVE. This ioctl does exactly the same thing as a write to the watchdog device, so the main loop in the above program could be -replaced with: +replaced with:: while (1) { ioctl(fd, WDIOC_KEEPALIVE, 0); @@ -82,14 +89,15 @@ replaced with: the argument to the ioctl is ignored. -Setting and getting the timeout: +Setting and getting the timeout +=============================== For some drivers it is possible to modify the watchdog timeout on the fly with the SETTIMEOUT ioctl, those drivers have the WDIOF_SETTIMEOUT flag set in their option field. The argument is an integer representing the timeout in seconds. The driver returns the real timeout used in the same variable, and this timeout might differ from -the requested one due to limitation of the hardware. +the requested one due to limitation of the hardware:: int timeout = 45; ioctl(fd, WDIOC_SETTIMEOUT, &timeout); @@ -99,18 +107,19 @@ This example might actually print "The timeout was set to 60 seconds" if the device has a granularity of minutes for its timeout. Starting with the Linux 2.4.18 kernel, it is possible to query the -current timeout using the GETTIMEOUT ioctl. +current timeout using the GETTIMEOUT ioctl:: ioctl(fd, WDIOC_GETTIMEOUT, &timeout); printf("The timeout was is %d seconds\n", timeout); -Pretimeouts: +Pretimeouts +=========== Some watchdog timers can be set to have a trigger go off before the actual time they will reset the system. This can be done with an NMI, interrupt, or other mechanism. This allows Linux to record useful information (like panic information and kernel coredumps) before it -resets. +resets:: pretimeout = 10; ioctl(fd, WDIOC_SETPRETIMEOUT, &pretimeout); @@ -121,89 +130,113 @@ the pretimeout. So, for instance, if you set the timeout to 60 seconds and the pretimeout to 10 seconds, the pretimeout will go off in 50 seconds. Setting a pretimeout to zero disables it. -There is also a get function for getting the pretimeout: +There is also a get function for getting the pretimeout:: ioctl(fd, WDIOC_GETPRETIMEOUT, &timeout); printf("The pretimeout was is %d seconds\n", timeout); Not all watchdog drivers will support a pretimeout. -Get the number of seconds before reboot: +Get the number of seconds before reboot +======================================= Some watchdog drivers have the ability to report the remaining time before the system will reboot. The WDIOC_GETTIMELEFT is the ioctl -that returns the number of seconds before reboot. +that returns the number of seconds before reboot:: ioctl(fd, WDIOC_GETTIMELEFT, &timeleft); printf("The timeout was is %d seconds\n", timeleft); -Environmental monitoring: +Environmental monitoring +======================== All watchdog drivers are required return more information about the system, some do temperature, fan and power level monitoring, some can tell you the reason for the last reboot of the system. The GETSUPPORT ioctl is -available to ask what the device can do: +available to ask what the device can do:: struct watchdog_info ident; ioctl(fd, WDIOC_GETSUPPORT, &ident); the fields returned in the ident struct are: + ================ ============================================= identity a string identifying the watchdog driver firmware_version the firmware version of the card if available options a flags describing what the device supports + ================ ============================================= the options field can have the following bits set, and describes what kind of information that the GET_STATUS and GET_BOOT_STATUS ioctls can return. [FIXME -- Is this correct?] + ================ ========================= WDIOF_OVERHEAT Reset due to CPU overheat + ================ ========================= The machine was last rebooted by the watchdog because the thermal limit was -exceeded +exceeded: + ============== ========== WDIOF_FANFAULT Fan failed + ============== ========== A system fan monitored by the watchdog card has failed + ============= ================ WDIOF_EXTERN1 External relay 1 + ============= ================ External monitoring relay/source 1 was triggered. Controllers intended for real world applications include external monitoring pins that will trigger a reset. + ============= ================ WDIOF_EXTERN2 External relay 2 + ============= ================ External monitoring relay/source 2 was triggered + ================ ===================== WDIOF_POWERUNDER Power bad/power fault + ================ ===================== The machine is showing an undervoltage status + =============== ============================= WDIOF_CARDRESET Card previously reset the CPU + =============== ============================= The last reboot was caused by the watchdog card + ================ ===================== WDIOF_POWEROVER Power over voltage + ================ ===================== The machine is showing an overvoltage status. Note that if one level is under and one over both bits will be set - this may seem odd but makes sense. + =================== ===================== WDIOF_KEEPALIVEPING Keep alive ping reply + =================== ===================== The watchdog saw a keepalive ping since it was last queried. + ================ ======================= WDIOF_SETTIMEOUT Can set/get the timeout + ================ ======================= The watchdog can do pretimeouts. + ================ ================================ WDIOF_PRETIMEOUT Pretimeout (in seconds), get/set + ================ ================================ For those drivers that return any bits set in the option field, the GETSTATUS and GETBOOTSTATUS ioctls can be used to ask for the current -status, and the status at the last reboot, respectively. +status, and the status at the last reboot, respectively:: int flags; ioctl(fd, WDIOC_GETSTATUS, &flags); @@ -216,22 +249,23 @@ Note that not all devices support these two calls, and some only support the GETBOOTSTATUS call. Some drivers can measure the temperature using the GETTEMP ioctl. The -returned value is the temperature in degrees fahrenheit. +returned value is the temperature in degrees fahrenheit:: int temperature; ioctl(fd, WDIOC_GETTEMP, &temperature); Finally the SETOPTIONS ioctl can be used to control some aspects of -the cards operation. +the cards operation:: int options = 0; ioctl(fd, WDIOC_SETOPTIONS, &options); The following options are available: + ================= ================================ WDIOS_DISABLECARD Turn off the watchdog timer WDIOS_ENABLECARD Turn on the watchdog timer WDIOS_TEMPPANIC Kernel panic on temperature trip + ================= ================================ [FIXME -- better explanations] - diff --git a/Documentation/watchdog/watchdog-kernel-api.txt b/Documentation/watchdog/watchdog-kernel-api.rst similarity index 90% rename from Documentation/watchdog/watchdog-kernel-api.txt rename to Documentation/watchdog/watchdog-kernel-api.rst index 3a91ef5af044..864edbe932c1 100644 --- a/Documentation/watchdog/watchdog-kernel-api.txt +++ b/Documentation/watchdog/watchdog-kernel-api.rst @@ -1,5 +1,7 @@ -The Linux WatchDog Timer Driver Core kernel API. =============================================== +The Linux WatchDog Timer Driver Core kernel API +=============================================== + Last reviewed: 12-Feb-2013 Wim Van Sebroeck @@ -9,7 +11,7 @@ Introduction This document does not describe what a WatchDog Timer (WDT) Driver or Device is. It also does not describe the API which can be used by user space to communicate with a WatchDog Timer. If you want to know this then please read the following -file: Documentation/watchdog/watchdog-api.txt . +file: Documentation/watchdog/watchdog-api.rst . So what does this document describe? It describes the API that can be used by WatchDog Timer Drivers that want to use the WatchDog Timer Driver Core @@ -23,10 +25,10 @@ The API Each watchdog timer driver that wants to use the WatchDog Timer Driver Core must #include (you would have to do this anyway when writing a watchdog device driver). This include file contains following -register/unregister routines: +register/unregister routines:: -extern int watchdog_register_device(struct watchdog_device *); -extern void watchdog_unregister_device(struct watchdog_device *); + extern int watchdog_register_device(struct watchdog_device *); + extern void watchdog_unregister_device(struct watchdog_device *); The watchdog_register_device routine registers a watchdog timer device. The parameter of this routine is a pointer to a watchdog_device structure. @@ -40,9 +42,9 @@ The watchdog subsystem includes an registration deferral mechanism, which allows you to register an watchdog as early as you wish during the boot process. -The watchdog device structure looks like this: +The watchdog device structure looks like this:: -struct watchdog_device { + struct watchdog_device { int id; struct device *parent; const struct attribute_group **groups; @@ -62,9 +64,10 @@ struct watchdog_device { struct watchdog_core_data *wd_data; unsigned long status; struct list_head deferred; -}; + }; It contains following fields: + * id: set by watchdog_register_device, id 0 is special. It has both a /dev/watchdog0 cdev (dynamic major, minor 0) as well as the old /dev/watchdog miscdev. The id is set automatically when calling @@ -114,9 +117,9 @@ It contains following fields: * deferred: entry in wtd_deferred_reg_list which is used to register early initialized watchdogs. -The list of watchdog operations is defined as: +The list of watchdog operations is defined as:: -struct watchdog_ops { + struct watchdog_ops { struct module *owner; /* mandatory operations */ int (*start)(struct watchdog_device *); @@ -129,7 +132,7 @@ struct watchdog_ops { unsigned int (*get_timeleft)(struct watchdog_device *); int (*restart)(struct watchdog_device *); long (*ioctl)(struct watchdog_device *, unsigned int, unsigned long); -}; + }; It is important that you first define the module owner of the watchdog timer driver's operations. This module owner will be used to lock the module when @@ -138,6 +141,7 @@ module and /dev/watchdog is still open). Some operations are mandatory and some are optional. The mandatory operations are: + * start: this is a pointer to the routine that starts the watchdog timer device. The routine needs a pointer to the watchdog timer device structure as a @@ -146,51 +150,64 @@ are: Not all watchdog timer hardware supports the same functionality. That's why all other routines/operations are optional. They only need to be provided if they are supported. These optional routines/operations are: + * stop: with this routine the watchdog timer device is being stopped. + The routine needs a pointer to the watchdog timer device structure as a parameter. It returns zero on success or a negative errno code for failure. Some watchdog timer hardware can only be started and not be stopped. A driver supporting such hardware does not have to implement the stop routine. + If a driver has no stop function, the watchdog core will set WDOG_HW_RUNNING and start calling the driver's keepalive pings function after the watchdog device is closed. + If a watchdog driver does not implement the stop function, it must set max_hw_heartbeat_ms. * ping: this is the routine that sends a keepalive ping to the watchdog timer hardware. + The routine needs a pointer to the watchdog timer device structure as a parameter. It returns zero on success or a negative errno code for failure. + Most hardware that does not support this as a separate function uses the start function to restart the watchdog timer hardware. And that's also what the watchdog timer driver core does: to send a keepalive ping to the watchdog timer hardware it will either use the ping operation (when available) or the start operation (when the ping operation is not available). + (Note: the WDIOC_KEEPALIVE ioctl call will only be active when the WDIOF_KEEPALIVEPING bit has been set in the option field on the watchdog's info structure). * status: this routine checks the status of the watchdog timer device. The status of the device is reported with watchdog WDIOF_* status flags/bits. + WDIOF_MAGICCLOSE and WDIOF_KEEPALIVEPING are reported by the watchdog core; it is not necessary to report those bits from the driver. Also, if no status function is provided by the driver, the watchdog core reports the status bits provided in the bootstatus variable of struct watchdog_device. + * set_timeout: this routine checks and changes the timeout of the watchdog timer device. It returns 0 on success, -EINVAL for "parameter out of range" and -EIO for "could not write value to the watchdog". On success this routine should set the timeout value of the watchdog_device to the achieved timeout value (which may be different from the requested one because the watchdog does not necessarily have a 1 second resolution). + Drivers implementing max_hw_heartbeat_ms set the hardware watchdog heartbeat to the minimum of timeout and max_hw_heartbeat_ms. Those drivers set the timeout value of the watchdog_device either to the requested timeout value (if it is larger than max_hw_heartbeat_ms), or to the achieved timeout value. (Note: the WDIOF_SETTIMEOUT needs to be set in the options field of the watchdog's info structure). + If the watchdog driver does not have to perform any action but setting the watchdog_device.timeout, this callback can be omitted. + If set_timeout is not provided but, WDIOF_SETTIMEOUT is set, the watchdog infrastructure updates the timeout value of the watchdog_device internally to the requested value. + If the pretimeout feature is used (WDIOF_PRETIMEOUT), then set_timeout must also take care of checking if pretimeout is still valid and set up the timer accordingly. This can't be done in the core without races, so it is the @@ -201,13 +218,16 @@ they are supported. These optional routines/operations are: seconds before the actual timeout would happen. It returns 0 on success, -EINVAL for "parameter out of range" and -EIO for "could not write value to the watchdog". A value of 0 disables pretimeout notification. + (Note: the WDIOF_PRETIMEOUT needs to be set in the options field of the watchdog's info structure). + If the watchdog driver does not have to perform any action but setting the watchdog_device.pretimeout, this callback can be omitted. That means if set_pretimeout is not provided but WDIOF_PRETIMEOUT is set, the watchdog infrastructure updates the pretimeout value of the watchdog_device internally to the requested value. + * get_timeleft: this routines returns the time that's left before a reset. * restart: this routine restarts the machine. It returns 0 on success or a negative errno code for failure. @@ -218,6 +238,7 @@ they are supported. These optional routines/operations are: The status bits should (preferably) be set with the set_bit and clear_bit alike bit-operations. The status bits that are defined are: + * WDOG_ACTIVE: this status bit indicates whether or not a watchdog timer device is active or not from user perspective. User space is expected to send heartbeat requests to the driver while this flag is set. @@ -235,22 +256,30 @@ bit-operations. The status bits that are defined are: To set the WDOG_NO_WAY_OUT status bit (before registering your watchdog timer device) you can either: + * set it statically in your watchdog_device struct with + .status = WATCHDOG_NOWAYOUT_INIT_STATUS, + (this will set the value the same as CONFIG_WATCHDOG_NOWAYOUT) or - * use the following helper function: - static inline void watchdog_set_nowayout(struct watchdog_device *wdd, int nowayout) + * use the following helper function:: + + static inline void watchdog_set_nowayout(struct watchdog_device *wdd, + int nowayout) + +Note: + The WatchDog Timer Driver Core supports the magic close feature and + the nowayout feature. To use the magic close feature you must set the + WDIOF_MAGICCLOSE bit in the options field of the watchdog's info structure. -Note: The WatchDog Timer Driver Core supports the magic close feature and -the nowayout feature. To use the magic close feature you must set the -WDIOF_MAGICCLOSE bit in the options field of the watchdog's info structure. The nowayout feature will overrule the magic close feature. To get or set driver specific data the following two helper functions should be -used: +used:: -static inline void watchdog_set_drvdata(struct watchdog_device *wdd, void *data) -static inline void *watchdog_get_drvdata(struct watchdog_device *wdd) + static inline void watchdog_set_drvdata(struct watchdog_device *wdd, + void *data) + static inline void *watchdog_get_drvdata(struct watchdog_device *wdd) The watchdog_set_drvdata function allows you to add driver specific data. The arguments of this function are the watchdog device where you want to add the @@ -260,10 +289,11 @@ The watchdog_get_drvdata function allows you to retrieve driver specific data. The argument of this function is the watchdog device where you want to retrieve data from. The function returns the pointer to the driver specific data. -To initialize the timeout field, the following function can be used: +To initialize the timeout field, the following function can be used:: -extern int watchdog_init_timeout(struct watchdog_device *wdd, - unsigned int timeout_parm, struct device *dev); + extern int watchdog_init_timeout(struct watchdog_device *wdd, + unsigned int timeout_parm, + struct device *dev); The watchdog_init_timeout function allows you to initialize the timeout field using the module timeout parameter or by retrieving the timeout-sec property from @@ -272,30 +302,33 @@ to set the default timeout value as timeout value in the watchdog_device and then use this function to set the user "preferred" timeout value. This routine returns zero on success and a negative errno code for failure. -To disable the watchdog on reboot, the user must call the following helper: +To disable the watchdog on reboot, the user must call the following helper:: -static inline void watchdog_stop_on_reboot(struct watchdog_device *wdd); + static inline void watchdog_stop_on_reboot(struct watchdog_device *wdd); To disable the watchdog when unregistering the watchdog, the user must call the following helper. Note that this will only stop the watchdog if the nowayout flag is not set. -static inline void watchdog_stop_on_unregister(struct watchdog_device *wdd); +:: + + static inline void watchdog_stop_on_unregister(struct watchdog_device *wdd); To change the priority of the restart handler the following helper should be -used: +used:: -void watchdog_set_restart_priority(struct watchdog_device *wdd, int priority); + void watchdog_set_restart_priority(struct watchdog_device *wdd, int priority); User should follow the following guidelines for setting the priority: + * 0: should be called in last resort, has limited restart capabilities * 128: default restart handler, use if no other handler is expected to be available, and/or if restart is sufficient to restart the entire system * 255: highest priority, will preempt all other restart handlers -To raise a pretimeout notification, the following function should be used: +To raise a pretimeout notification, the following function should be used:: -void watchdog_notify_pretimeout(struct watchdog_device *wdd) + void watchdog_notify_pretimeout(struct watchdog_device *wdd) The function can be called in the interrupt context. If watchdog pretimeout governor framework (kbuild CONFIG_WATCHDOG_PRETIMEOUT_GOV symbol) is enabled, diff --git a/Documentation/watchdog/watchdog-parameters.rst b/Documentation/watchdog/watchdog-parameters.rst new file mode 100644 index 000000000000..b121caae7798 --- /dev/null +++ b/Documentation/watchdog/watchdog-parameters.rst @@ -0,0 +1,736 @@ +========================== +WatchDog Module Parameters +========================== + +This file provides information on the module parameters of many of +the Linux watchdog drivers. Watchdog driver parameter specs should +be listed here unless the driver has its own driver-specific information +file. + +See Documentation/admin-guide/kernel-parameters.rst for information on +providing kernel parameters for builtin drivers versus loadable +modules. + +------------------------------------------------- + +acquirewdt: + wdt_stop: + Acquire WDT 'stop' io port (default 0x43) + wdt_start: + Acquire WDT 'start' io port (default 0x443) + nowayout: + Watchdog cannot be stopped once started + (default=kernel config parameter) + +------------------------------------------------- + +advantechwdt: + wdt_stop: + Advantech WDT 'stop' io port (default 0x443) + wdt_start: + Advantech WDT 'start' io port (default 0x443) + timeout: + Watchdog timeout in seconds. 1<= timeout <=63, default=60. + nowayout: + Watchdog cannot be stopped once started + (default=kernel config parameter) + +------------------------------------------------- + +alim1535_wdt: + timeout: + Watchdog timeout in seconds. (0 < timeout < 18000, default=60 + nowayout: + Watchdog cannot be stopped once started + (default=kernel config parameter) + +------------------------------------------------- + +alim7101_wdt: + timeout: + Watchdog timeout in seconds. (1<=timeout<=3600, default=30 + use_gpio: + Use the gpio watchdog (required by old cobalt boards). + default=0/off/no + nowayout: + Watchdog cannot be stopped once started + (default=kernel config parameter) + +------------------------------------------------- + +ar7_wdt: + margin: + Watchdog margin in seconds (default=60) + nowayout: + Disable watchdog shutdown on close + (default=kernel config parameter) + +------------------------------------------------- + +armada_37xx_wdt: + timeout: + Watchdog timeout in seconds. (default=120) + nowayout: + Disable watchdog shutdown on close + (default=kernel config parameter) + +------------------------------------------------- + +at91rm9200_wdt: + wdt_time: + Watchdog time in seconds. (default=5) + nowayout: + Watchdog cannot be stopped once started + (default=kernel config parameter) + +------------------------------------------------- + +at91sam9_wdt: + heartbeat: + Watchdog heartbeats in seconds. (default = 15) + nowayout: + Watchdog cannot be stopped once started + (default=kernel config parameter) + +------------------------------------------------- + +bcm47xx_wdt: + wdt_time: + Watchdog time in seconds. (default=30) + nowayout: + Watchdog cannot be stopped once started + (default=kernel config parameter) + +------------------------------------------------- + +coh901327_wdt: + margin: + Watchdog margin in seconds (default 60s) + +------------------------------------------------- + +cpu5wdt: + port: + base address of watchdog card, default is 0x91 + verbose: + be verbose, default is 0 (no) + ticks: + count down ticks, default is 10000 + +------------------------------------------------- + +cpwd: + wd0_timeout: + Default watchdog0 timeout in 1/10secs + wd1_timeout: + Default watchdog1 timeout in 1/10secs + wd2_timeout: + Default watchdog2 timeout in 1/10secs + +------------------------------------------------- + +da9052wdt: + timeout: + Watchdog timeout in seconds. 2<= timeout <=131, default=2.048s + nowayout: + Watchdog cannot be stopped once started + (default=kernel config parameter) + +------------------------------------------------- + +davinci_wdt: + heartbeat: + Watchdog heartbeat period in seconds from 1 to 600, default 60 + +------------------------------------------------- + +ebc-c384_wdt: + timeout: + Watchdog timeout in seconds. (1<=timeout<=15300, default=60) + nowayout: + Watchdog cannot be stopped once started + +------------------------------------------------- + +ep93xx_wdt: + nowayout: + Watchdog cannot be stopped once started + timeout: + Watchdog timeout in seconds. (1<=timeout<=3600, default=TBD) + +------------------------------------------------- + +eurotechwdt: + nowayout: + Watchdog cannot be stopped once started + (default=kernel config parameter) + io: + Eurotech WDT io port (default=0x3f0) + irq: + Eurotech WDT irq (default=10) + ev: + Eurotech WDT event type (default is `int`) + +------------------------------------------------- + +gef_wdt: + nowayout: + Watchdog cannot be stopped once started + (default=kernel config parameter) + +------------------------------------------------- + +geodewdt: + timeout: + Watchdog timeout in seconds. 1<= timeout <=131, default=60. + nowayout: + Watchdog cannot be stopped once started + (default=kernel config parameter) + +------------------------------------------------- + +i6300esb: + heartbeat: + Watchdog heartbeat in seconds. (11 for debug, (default 0) + +------------------------------------------------- + +sa1100_wdt: + margin: + Watchdog margin in seconds (default 60s) + +------------------------------------------------- + +sb_wdog: + timeout: + Watchdog timeout in microseconds (max/default 8388607 or 8.3ish secs) + +------------------------------------------------- + +sbc60xxwdt: + wdt_stop: + SBC60xx WDT 'stop' io port (default 0x45) + wdt_start: + SBC60xx WDT 'start' io port (default 0x443) + timeout: + Watchdog timeout in seconds. (1<=timeout<=3600, default=30) + nowayout: + Watchdog cannot be stopped once started + (default=kernel config parameter) + +------------------------------------------------- + +sbc7240_wdt: + timeout: + Watchdog timeout in seconds. (1<=timeout<=255, default=30) + nowayout: + Disable watchdog when closing device file + +------------------------------------------------- + +sbc8360: + timeout: + Index into timeout table (0-63) (default=27 (60s)) + nowayout: + Watchdog cannot be stopped once started + (default=kernel config parameter) + +------------------------------------------------- + +sbc_epx_c3: + nowayout: + Watchdog cannot be stopped once started + (default=kernel config parameter) + +------------------------------------------------- + +sbc_fitpc2_wdt: + margin: + Watchdog margin in seconds (default 60s) + nowayout: + Watchdog cannot be stopped once started + +------------------------------------------------- + +sbsa_gwdt: + timeout: + Watchdog timeout in seconds. (default 10s) + action: + Watchdog action at the first stage timeout, + set to 0 to ignore, 1 to panic. (default=0) + nowayout: + Watchdog cannot be stopped once started + (default=kernel config parameter) + +------------------------------------------------- + +sc1200wdt: + isapnp: + When set to 0 driver ISA PnP support will be disabled (default=1) + io: + io port + timeout: + range is 0-255 minutes, default is 1 + nowayout: + Watchdog cannot be stopped once started + (default=kernel config parameter) + +------------------------------------------------- + +sc520_wdt: + timeout: + Watchdog timeout in seconds. (1 <= timeout <= 3600, default=30) + nowayout: + Watchdog cannot be stopped once started + (default=kernel config parameter) + +------------------------------------------------- + +sch311x_wdt: + force_id: + Override the detected device ID + therm_trip: + Should a ThermTrip trigger the reset generator + timeout: + Watchdog timeout in seconds. 1<= timeout <=15300, default=60 + nowayout: + Watchdog cannot be stopped once started + (default=kernel config parameter) + +------------------------------------------------- + +scx200_wdt: + margin: + Watchdog margin in seconds + nowayout: + Disable watchdog shutdown on close + +------------------------------------------------- + +shwdt: + clock_division_ratio: + Clock division ratio. Valid ranges are from 0x5 (1.31ms) + to 0x7 (5.25ms). (default=7) + heartbeat: + Watchdog heartbeat in seconds. (1 <= heartbeat <= 3600, default=30 + nowayout: + Watchdog cannot be stopped once started + (default=kernel config parameter) + +------------------------------------------------- + +smsc37b787_wdt: + timeout: + range is 1-255 units, default is 60 + nowayout: + Watchdog cannot be stopped once started + (default=kernel config parameter) + +------------------------------------------------- + +softdog: + soft_margin: + Watchdog soft_margin in seconds. + (0 < soft_margin < 65536, default=60) + nowayout: + Watchdog cannot be stopped once started + (default=kernel config parameter) + soft_noboot: + Softdog action, set to 1 to ignore reboots, 0 to reboot + (default=0) + +------------------------------------------------- + +stmp3xxx_wdt: + heartbeat: + Watchdog heartbeat period in seconds from 1 to 4194304, default 19 + +------------------------------------------------- + +tegra_wdt: + heartbeat: + Watchdog heartbeats in seconds. (default = 120) + nowayout: + Watchdog cannot be stopped once started + (default=kernel config parameter) + +------------------------------------------------- + +ts72xx_wdt: + timeout: + Watchdog timeout in seconds. (1 <= timeout <= 8, default=8) + nowayout: + Disable watchdog shutdown on close + +------------------------------------------------- + +twl4030_wdt: + nowayout: + Watchdog cannot be stopped once started + (default=kernel config parameter) + +------------------------------------------------- + +txx9wdt: + timeout: + Watchdog timeout in seconds. (01 for debug, (default 0) -------------------------------------------------- -sa1100_wdt: -margin: Watchdog margin in seconds (default 60s) -------------------------------------------------- -sb_wdog: -timeout: Watchdog timeout in microseconds (max/default 8388607 or 8.3ish secs) -------------------------------------------------- -sbc60xxwdt: -wdt_stop: SBC60xx WDT 'stop' io port (default 0x45) -wdt_start: SBC60xx WDT 'start' io port (default 0x443) -timeout: Watchdog timeout in seconds. (1<=timeout<=3600, default=30) -nowayout: Watchdog cannot be stopped once started - (default=kernel config parameter) -------------------------------------------------- -sbc7240_wdt: -timeout: Watchdog timeout in seconds. (1<=timeout<=255, default=30) -nowayout: Disable watchdog when closing device file -------------------------------------------------- -sbc8360: -timeout: Index into timeout table (0-63) (default=27 (60s)) -nowayout: Watchdog cannot be stopped once started - (default=kernel config parameter) -------------------------------------------------- -sbc_epx_c3: -nowayout: Watchdog cannot be stopped once started - (default=kernel config parameter) -------------------------------------------------- -sbc_fitpc2_wdt: -margin: Watchdog margin in seconds (default 60s) -nowayout: Watchdog cannot be stopped once started -------------------------------------------------- -sbsa_gwdt: -timeout: Watchdog timeout in seconds. (default 10s) -action: Watchdog action at the first stage timeout, - set to 0 to ignore, 1 to panic. (default=0) -nowayout: Watchdog cannot be stopped once started - (default=kernel config parameter) -------------------------------------------------- -sc1200wdt: -isapnp: When set to 0 driver ISA PnP support will be disabled (default=1) -io: io port -timeout: range is 0-255 minutes, default is 1 -nowayout: Watchdog cannot be stopped once started - (default=kernel config parameter) -------------------------------------------------- -sc520_wdt: -timeout: Watchdog timeout in seconds. (1 <= timeout <= 3600, default=30) -nowayout: Watchdog cannot be stopped once started - (default=kernel config parameter) -------------------------------------------------- -sch311x_wdt: -force_id: Override the detected device ID -therm_trip: Should a ThermTrip trigger the reset generator -timeout: Watchdog timeout in seconds. 1<= timeout <=15300, default=60 -nowayout: Watchdog cannot be stopped once started - (default=kernel config parameter) -------------------------------------------------- -scx200_wdt: -margin: Watchdog margin in seconds -nowayout: Disable watchdog shutdown on close -------------------------------------------------- -shwdt: -clock_division_ratio: Clock division ratio. Valid ranges are from 0x5 (1.31ms) - to 0x7 (5.25ms). (default=7) -heartbeat: Watchdog heartbeat in seconds. (1 <= heartbeat <= 3600, default=30 -nowayout: Watchdog cannot be stopped once started - (default=kernel config parameter) -------------------------------------------------- -smsc37b787_wdt: -timeout: range is 1-255 units, default is 60 -nowayout: Watchdog cannot be stopped once started - (default=kernel config parameter) -------------------------------------------------- -softdog: -soft_margin: Watchdog soft_margin in seconds. - (0 < soft_margin < 65536, default=60) -nowayout: Watchdog cannot be stopped once started - (default=kernel config parameter) -soft_noboot: Softdog action, set to 1 to ignore reboots, 0 to reboot - (default=0) -------------------------------------------------- -stmp3xxx_wdt: -heartbeat: Watchdog heartbeat period in seconds from 1 to 4194304, default 19 -------------------------------------------------- -tegra_wdt: -heartbeat: Watchdog heartbeats in seconds. (default = 120) -nowayout: Watchdog cannot be stopped once started - (default=kernel config parameter) -------------------------------------------------- -ts72xx_wdt: -timeout: Watchdog timeout in seconds. (1 <= timeout <= 8, default=8) -nowayout: Disable watchdog shutdown on close -------------------------------------------------- -twl4030_wdt: -nowayout: Watchdog cannot be stopped once started - (default=kernel config parameter) -------------------------------------------------- -txx9wdt: -timeout: Watchdog timeout in seconds. (0 @@ -16,4 +18,5 @@ On resume, a watchdog timer shall be reset to its selected value to give userspace enough time to resume. [1] [2] [1] https://patchwork.kernel.org/patch/10252209/ + [2] https://patchwork.kernel.org/patch/10711625/ diff --git a/Documentation/watchdog/wdt.txt b/Documentation/watchdog/wdt.rst similarity index 68% rename from Documentation/watchdog/wdt.txt rename to Documentation/watchdog/wdt.rst index ed2f0b860869..d97b0361535b 100644 --- a/Documentation/watchdog/wdt.txt +++ b/Documentation/watchdog/wdt.rst @@ -1,11 +1,14 @@ +============================================================ +WDT Watchdog Timer Interfaces For The Linux Operating System +============================================================ + Last Reviewed: 10/05/2007 - WDT Watchdog Timer Interfaces For The Linux Operating System - Alan Cox +Alan Cox - ICS WDT501-P - ICS WDT501-P (no fan tachometer) - ICS WDT500-P + - ICS WDT501-P + - ICS WDT501-P (no fan tachometer) + - ICS WDT500-P All the interfaces provide /dev/watchdog, which when open must be written to within a timeout or the machine will reboot. Each write delays the reboot @@ -21,19 +24,26 @@ degrees Fahrenheit. Each read returns a single byte giving the temperature. The third interface logs kernel messages on additional alert events. The ICS ISA-bus wdt card cannot be safely probed for. Instead you need to -pass IO address and IRQ boot parameters. E.g.: +pass IO address and IRQ boot parameters. E.g.:: + wdt.io=0x240 wdt.irq=11 Other "wdt" driver parameters are: + + =========== ====================================================== heartbeat Watchdog heartbeat in seconds (default 60) nowayout Watchdog cannot be stopped once started (kernel - build parameter) + build parameter) tachometer WDT501-P Fan Tachometer support (0=disable, default=0) type WDT501-P Card type (500 or 501, default=500) + =========== ====================================================== Features -------- - WDT501P WDT500P + +================ ======= ======= + WDT501P WDT500P +================ ======= ======= Reboot Timer X X External Reboot X X I/O Port Monitor o o @@ -42,9 +52,12 @@ Fan Speed X o Power Under X o Power Over X o Overheat X o +================ ======= ======= The external event interfaces on the WDT boards are not currently supported. Minor numbers are however allocated for it. -Example Watchdog Driver: see samples/watchdog/watchdog-simple.c +Example Watchdog Driver: + + see samples/watchdog/watchdog-simple.c diff --git a/MAINTAINERS b/MAINTAINERS index 71b4754ea7c3..b0b674f5aaca 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -7040,7 +7040,7 @@ F: drivers/media/usb/hdpvr/ HEWLETT PACKARD ENTERPRISE ILO NMI WATCHDOG DRIVER M: Jerry Hoemann S: Supported -F: Documentation/watchdog/hpwdt.txt +F: Documentation/watchdog/hpwdt.rst F: drivers/watchdog/hpwdt.c HEWLETT-PACKARD SMART ARRAY RAID DRIVER (hpsa) diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index ffe754539f5a..6cad0b33d7ad 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -18,7 +18,7 @@ menuconfig WATCHDOG reboot the machine) and a driver for hardware watchdog boards, which are more robust and can also keep track of the temperature inside your computer. For details, read - in the kernel source. + in the kernel source. The watchdog is usually used together with the watchdog daemon which is available from @@ -1870,7 +1870,7 @@ config BOOKE_WDT Watchdog driver for PowerPC Book-E chips, such as the Freescale MPC85xx SOCs and the IBM PowerPC 440. - Please see Documentation/watchdog/watchdog-api.txt for + Please see Documentation/watchdog/watchdog-api.rst for more information. config BOOKE_WDT_DEFAULT_TIMEOUT @@ -2019,7 +2019,7 @@ config PCWATCHDOG This card simply watches your kernel to make sure it doesn't freeze, and if it does, it reboots your computer after a certain amount of time. This driver is like the WDT501 driver but for different - hardware. Please read . The PC + hardware. Please read . The PC watchdog cards can be ordered from . To compile this driver as a module, choose M here: the diff --git a/drivers/watchdog/smsc37b787_wdt.c b/drivers/watchdog/smsc37b787_wdt.c index 13c817ea1d6a..f5713030d0f7 100644 --- a/drivers/watchdog/smsc37b787_wdt.c +++ b/drivers/watchdog/smsc37b787_wdt.c @@ -36,7 +36,7 @@ * mknod /dev/watchdog c 10 130 * * For an example userspace keep-alive daemon, see: - * Documentation/watchdog/wdt.txt + * Documentation/watchdog/wdt.rst */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt